﻿    <?php  
    /** 
    * 通用的树型类，可以生成任何树型结构 
    */  
    class tree {  
        /** 
        * 生成树型结构所需要的2维数组 
        * @var array 
        */  
        public $arr = array();  
      
        /** 
        * 生成树型结构所需修饰符号，可以换成图片 
        * @var array 
        */  
        public $icon = array('│','├','└');  
        public $nbsp = " ";  
      
        /** 
        * @access private 
        */  
        public $ret = '';  
      
        /** 
        * 构造函数，初始化类 
        * @param array 2维数组，例如： 
        * array( 
        *      1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'), 
        *      2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'), 
        *      3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'), 
        *      4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'), 
        *      5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'), 
        *      6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'), 
        *      7 => array('id'=>'7','parentid'=>3,'name'=>'三级栏目二') 
        *      ) 
        */  
        public function init($arr=array()){  
           $this->arr = $arr;  
           $this->ret = '';  
           return is_array($arr);  
        }  
      
        /** 
        * 得到父级数组 
        * @param int 
        * @return array 
        */  
        public function get_parent($myid){  
            $newarr = array();  
            if(!isset($this->arr[$myid])) return false;  
            $pid = $this->arr[$myid]['parentid'];  
            $pid = $this->arr[$pid]['parentid'];  
            if(is_array($this->arr)){  
                foreach($this->arr as $id => $a){  
                    if($a['parentid'] == $pid) $newarr[$id] = $a;  
                }  
            }  
            return $newarr;  
        }  
      
        /** 
        * 得到子级数组 
        * @param int 
        * @return array 
        */  
        public function get_child($myid){  
            $a = $newarr = array();  
            if(is_array($this->arr)){  
                foreach($this->arr as $id => $a){  
                    if($a['parentid'] == $myid) $newarr[$id] = $a;  
                }  
            }  
            return $newarr ? $newarr : false;  
        }  
      
        /** 
        * 得到当前位置数组 
        * @param int 
        * @return array 
        */  
        public function get_pos($myid,&$newarr){  
            $a = array();  
            if(!isset($this->arr[$myid])) return false;  
            $newarr[] = $this->arr[$myid];  
            $pid = $this->arr[$myid]['parentid'];  
            if(isset($this->arr[$pid])){  
                $this->get_pos($pid,$newarr);  
            }  
            if(is_array($newarr)){  
                krsort($newarr);  
                foreach($newarr as $v){  
                    $a[$v['id']] = $v;  
                }  
            }  
            return $a;  
        }  
      
        /** 
        * 得到树型结构 
        * @param int ID，表示获得这个ID下的所有子级 
        * @param string 生成树型结构的基本代码，例如："<option value=\$id \$selected>\$spacer\$name</option>" 
        * @param int 被选中的ID，比如在做树型下拉框的时候需要用到 
        * @return string 
        */  
        public function get_tree($myid, $str, $sid = 0, $adds = '', $str_group = ''){  
            $number=1;  
            $child = $this->get_child($myid);  
            if(is_array($child)){  
                $total = count($child);  
                foreach($child as $id=>$value){  
                    $j=$k='';  
                    if($number==$total){  
                        $j .= $this->icon[2];  
                    }else{  
                        $j .= $this->icon[1];  
                        $k = $adds ? $this->icon[0] : '';  
                    }  
                    $spacer = $adds ? $adds.$j : '';  
                    $selected = $id==$sid ? 'selected' : '';  
                    @extract($value);  
                    $parentid == 0 && $str_group ? eval("\$nstr = \"$str_group\";") : eval("\$nstr = \"$str\";");  
                    $this->ret .= $nstr;  
                    $nbsp = $this->nbsp;  
                    $this->get_tree($id, $str, $sid, $adds.$k.$nbsp,$str_group);  
                    $number++;  
                }  
            }  
            return $this->ret;  
        }  
        /** 
        * 同上一方法类似,但允许多选 
        */  
        public function get_tree_multi($myid, $str, $sid = 0, $adds = ''){  
            $number=1;  
            $child = $this->get_child($myid);  
            if(is_array($child)){  
                $total = count($child);  
                foreach($child as $id=>$a){  
                    $j=$k='';  
                    if($number==$total){  
                        $j .= $this->icon[2];  
                    }else{  
                        $j .= $this->icon[1];  
                        $k = $adds ? $this->icon[0] : '';  
                    }  
                    $spacer = $adds ? $adds.$j : '';  
                      
                    $selected = $this->have($sid,$id) ? 'selected' : '';  
                    @extract($a);  
                    eval("\$nstr = \"$str\";");  
                    $this->ret .= $nstr;  
                    $this->get_tree_multi($id, $str, $sid, $adds.$k.' ');  
                    $number++;  
                }  
            }  
            return $this->ret;  
        }  
         /** 
        * @param integer $myid 要查询的ID 
        * @param string $str   第一种HTML代码方式 
        * @param string $str2  第二种HTML代码方式 
        * @param integer $sid  默认选中 
        * @param integer $adds 前缀 
        */  
        public function get_tree_category($myid, $str, $str2, $sid = 0, $adds = ''){  
            $number=1;  
            $child = $this->get_child($myid);  
            if(is_array($child)){  
                $total = count($child);  
                foreach($child as $id=>$a){  
                    $j=$k='';  
                    if($number==$total){  
                        $j .= $this->icon[2];  
                    }else{  
                        $j .= $this->icon[1];  
                        $k = $adds ? $this->icon[0] : '';  
                    }  
                    $spacer = $adds ? $adds.$j : '';  
                      
                    $selected = $this->have($sid,$id) ? 'selected' : '';  
                    @extract($a);  
                    if (empty($html_disabled)) {  
                        eval("\$nstr = \"$str\";");  
                    } else {  
                        eval("\$nstr = \"$str2\";");  
                    }  
                    $this->ret .= $nstr;  
                    $this->get_tree_category($id, $str, $str2, $sid, $adds.$k.' ');  
                    $number++;  
                }  
            }  
            return $this->ret;  
        }  
          
        /** 
         * 同上一类方法，jquery treeview 风格，可伸缩样式（需要treeview插件支持） 
         * @param $myid 表示获得这个ID下的所有子级 
         * @param $effected_id 需要生成treeview目录数的id 
         * @param $str 末级样式 
         * @param $str2 目录级别样式 
         * @param $showlevel 直接显示层级数，其余为异步显示，0为全部限制 
         * @param $style 目录样式 默认 filetree 可增加其他样式如'filetree treeview-famfamfam' 
         * @param $currentlevel 计算当前层级，递归使用 适用改函数时不需要用该参数 
         * @param $recursion 递归使用 外部调用时为FALSE 
         */  
        function get_treeview($myid,$effected_id='example',$str="<span class='file'>\$name</span>", $str2="<span class='folder'>\$name</span>" ,$showlevel = 0 ,$style='filetree ' , $currentlevel = 1,$recursion=FALSE) {  
            $child = $this->get_child($myid);  
            if(!defined('EFFECTED_INIT')){  
               $effected = ' id="'.$effected_id.'"';  
               define('EFFECTED_INIT', 1);  
            } else {  
               $effected = '';  
            }  
            $placeholder =  '<ul><li><span class="placeholder"></span></li></ul>';  
            if(!$recursion) $this->str .='<ul'.$effected.'  class="'.$style.'">';  
            foreach($child as $id=>$a) {  
      
                @extract($a);  
                if($showlevel > 0 && $showlevel == $currentlevel && $this->get_child($id)) $folder = 'hasChildren'; //如设置显示层级模式@2011.07.01  
                $floder_status = isset($folder) ? ' class="'.$folder.'"' : '';        
                $this->str .= $recursion ? '<ul><li'.$floder_status.' id=\''.$id.'\'>' : '<li'.$floder_status.' id=\''.$id.'\'>';  
                $recursion = FALSE;  
                if($this->get_child($id)){  
                    eval("\$nstr = \"$str2\";");  
                    $this->str .= $nstr;  
                    if($showlevel == 0 || ($showlevel > 0 && $showlevel > $currentlevel)) {  
                        $this->get_treeview($id, $effected_id, $str, $str2, $showlevel, $style, $currentlevel+1, TRUE);  
                    } elseif($showlevel > 0 && $showlevel == $currentlevel) {  
                        $this->str .= $placeholder;  
                    }  
                } else {  
                    eval("\$nstr = \"$str\";");  
                    $this->str .= $nstr;  
                }  
                $this->str .=$recursion ? '</li></ul>': '</li>';  
            }  
            if(!$recursion)  $this->str .='</ul>';  
            return $this->str;  
        }  
          
        /** 
         * 获取子栏目json 
         * Enter description here ... 
         * @param unknown_type $myid 
         */  
        public function creat_sub_json($myid, $str='') {  
            $sub_cats = $this->get_child($myid);  
            $n = 0;  
            if(is_array($sub_cats)) foreach($sub_cats as $c) {            
                $data[$n]['id'] = iconv(CHARSET,'utf-8',$c['catid']);  
                if($this->get_child($c['catid'])) {  
                    $data[$n]['liclass'] = 'hasChildren';  
                    $data[$n]['children'] = array(array('text'=>' ','classes'=>'placeholder'));  
                    $data[$n]['classes'] = 'folder';  
                    $data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);  
                } else {                  
                    if($str) {  
                        @extract(array_iconv($c,CHARSET,'utf-8'));  
                        eval("\$data[$n]['text'] = \"$str\";");  
                    } else {  
                        $data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);  
                    }  
                }  
                $n++;  
            }  
            return json_encode($data);        
        }  
        private function have($list,$item){  
            return(strpos(',,'.$list.',',','.$item.','));  
        }  
    }  
    ?>  